Known Issues:
* Unlike the previous releases, this release O2 optimization level doesn't
unroll loop. To tune the strategy to get better performance for your
case, please refer to unrolling related parameters in associated gcc manual.
* The gcc regression test case pr42575.c now fails due to suboptimal code
on 64-bit integer multiply caused by gcc new rtx cost model.
* Ubuntu 13.10/14.04 PPA release doesn't have documentation due to incompatibility
to latest texinfo.
* Since Ubuntu 14.04, the Ubuntu official PPA has tool chain with same name as ours.
Those who install tool chain through our Launchpad PPA will be impacted. So to
correctly install our tool chain on 14.04, a corresponding version should be
appended to apt-get command which looks like
"sudo apt-get install gcc-arm-none-eabi=4-8-2014q2-0trusty9".
We are working with relevant Debian/Ubuntu people to consolidate them. Hopefully
there will be a unified ARM embedded tool chain coming from official PPA.

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